S:The notebooks are over there. 57
第1题:
设有关系R、S、T如下图所示,其中,关系T是(57)运算的结果。

A.S∪R
B.S-R
C.S∩R
D.S×R
第2题:
超前校正环节C(s)=(4s+1)/(s+1)的最大超前相角约为______。
A.57°#B.37°#C.27°#D.第3题:
【单选题】由起航点30°10'N,120°08'E至到达点10°30'N,145°05'E的纬差与经差为 。
A.44°40'N,024°57'E
B.19°40'S,024°57'E
C.19°40'N,024°57'W
D.40°40'S,024°57'W
第4题:
Mobile computers-which(71)laptops, notebooks, subnotebooks and handhelds-(72)so ubiquitous in such a short time, no surprise to hear who say: "It will define the leading edge(73)the next five years or so." The most remarkable(74)mobile computers is the amount of data storage and memory packed(75)their tiny boxes. These devices not only handle windows easily but also run storage-hungry programs.
A.included
B.include
C.have included
D.have become
E.had become
第5题:
排列13s57k84为奇排列,则s=2,k=6